Plant Clinic

Pest Management Calendar

This calendar provides information about life cycle events for common Missoula County plants, pests, and diseases.

June 2026

This Month

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May 31	Jun 1	2	3	4	5	6
	12:00 am Hang sticky traps in Cherry trees now		12:00 am Check for Apricot and Apple Scab infection		12:00 am Check for Codling Moth Larva

7	8	9	10	11	12	13
12:00 am Check for Codling Moth Larva	12:00 am Time to Aerate Lawns				12:00 am Check for Elm Leaf Beetle larva

14	15	16	17	18	19	20
12:00 am Check for Elm Leaf Beetle larva	12:00 am Check for Western Cherry fruit fly - treat now		12:00 am Watch for Ladybugs, Lacewings, & parasitic wasps - Do Not Treat!		12:00 am Check for Leafrollers on fruit and boxelder treats

21	22	23	24	25	26	27
12:00 am Check for Leafrollers on fruit and boxelder treats	12:00 am Check for Rust & Blister Mites on Mountain Ash		12:00 am Check for Cottonwood Leaf Beetle larvae
			12:00 am Check for Pear Slugs

28	29	Jun 30	Jul 1	2	3	4
12:00 am Apply Pine Beetle repellant pheremones	12:00 am Leafrollers start to pupate

Hang sticky traps in Cherry trees now (Day 1 of 2 )

Starts 12:00 am

Hang sticky traps in Cherry trees now (Day 2 of 2 )

Until 11:00 pm

Check for Apricot and Apple Scab infection (Day 1 of 2 )

Starts 12:00 am

Check for Apricot and Apple Scab infection (Day 2 of 2 )

Until 11:00 pm

Check for Codling Moth Larva (Day 1 of 3 )

Starts 12:00 am

Check for Codling Moth Larva (Day 2 of 3 )

All Day

Check for Codling Moth Larva (Day 3 of 3 )

Until 11:00 pm

Time to Aerate Lawns (Day 1 of 2 )

Starts 12:00 am

Time to Aerate Lawns (Day 2 of 2 )

Until 11:00 pm

Check for Elm Leaf Beetle larva (Day 1 of 3 )

Starts 12:00 am

Check for Elm Leaf Beetle larva (Day 2 of 3 )

All Day

Check for Elm Leaf Beetle larva (Day 3 of 3 )

Until 11:00 pm

Check for Western Cherry fruit fly - treat now (Day 1 of 2 )

Starts 12:00 am

Check for Western Cherry fruit fly - treat now (Day 2 of 2 )

Until 11:00 pm

Watch for Ladybugs, Lacewings, & parasitic wasps - Do Not Treat! (Day 1 of 2 )

Starts 12:00 am

Watch for Ladybugs, Lacewings, & parasitic wasps - Do Not Treat! (Day 2 of 2 )

Until 11:00 pm

Check for Leafrollers on fruit and boxelder treats (Day 1 of 3 )

Starts 12:00 am

Check for Leafrollers on fruit and boxelder treats (Day 2 of 3 )

All Day

Check for Leafrollers on fruit and boxelder treats (Day 3 of 3 )

Until 11:00 pm

Check for Rust & Blister Mites on Mountain Ash (Day 1 of 2 )

Starts 12:00 am

Check for Rust & Blister Mites on Mountain Ash (Day 2 of 2 )

Until 11:00 pm

Apply Pine Beetle repellant pheremones

12:00 am - 11:00 pm

Leafrollers start to pupate (Day 1 of 3 )

Starts 12:00 am

Leafrollers start to pupate (Day 2 of 3 )

All Day

Using Integrated Pest Management (IPM) strategies

IPM means getting to know your pests.

When is the pest MOST vulnerable, infective, or invasive?
When is the pest most vulnerable to least-toxic management strategies?
What is the least-toxic management tool that can be used successfully?

IPM optimizes plant health through the following:

Managing garden and landscape soils to promote drainage and aeration
Maximizing soil health by adding organic matter and properly timed fertilizers.
Pruning and irrigating based on the needs of particular plants.
Knowing the plant's level of susceptibility to pest damage.